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OpenSSL is a Secure Sockets Layer toolkit based on the SSLeay library. It supports Secure Sockets Layer (SSL) v2 and v3 specification and Transport Layer Security (TLS) v1.0/v1.1/v1.2 protocols but is also usable as a general purpose cryptography library.

The OS/2 version is supplied as executable and as a DLL file, either of which can be used from any programming language or tool, but in addition the it can be used as a C library for building SSL capabilities into your programs or as just for its cryptographic functions.

Please note if you have been using older 0.9.x versions you may need to do some testing and possibly code re-factoring before using 1.x, since a few features were removed in the newer version.


  • EMX 0.9x or kLIBC 0.6.x depending on version chosen.
  • OS/2 Warp 3 for the EMX version, OS/2 Warp 4 for the kLIBC built variant.